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Item 6 Appendix 1b Plans 20250300DET Hydro Electric Scheme Blairgowrie

Cairngorms Nation­al Park Author­ity Ugh­dar­ras Pàirc Nàiseanta a’ Mhon­aidh Ruaidh

Item 6 Appendix 1b 24 April 2026 Page 1 of 6

Agenda item 6

Appendix 1b

2025/0300/DET

Plans

NOTES:

Key:

  • Own­er­ship Boundary
  • Devel­op­ment Boundary
  • Devel­op­ment Bound­ary with no works proposed
  • Exist­ing Track

Own­er­ship Bound­ary is out­with the area of the drawing

Devel­op­ment Area

  • Intake 1 — 7m x 5m = 35m²
  • Intake 2 — 7m x 3m = 21m²
  • Pen­stock — 782m x 1m = 782m²
  • Tur­bine House — 6m x 6m = 36m²
  • Trans­fer Pipe — 170m x 1m = 170m²
  • Out­fall — 16m x 1m = 16m²
  • Cable Run — 565m x 0.3m = 169.5m²
  • Lay­down Area — 20m x 10m = 200m²

Total Work­ing Area = 1429.5m²

Total Devel­op­ment Bound­ary Area (includ­ing area with no works) = 83,375m²

This doc­u­ment is con­fid­en­tial and for the sole use of the inten­ded recip­i­ent. Any unau­thor­ised use of this doc­u­ment is strictly prohibited.

Rev.DrawnCheckedDescrip­tionDate
03LSLSUpdated draw­ing format to dis­play single red line boundary06/11/25
02KMLSUpdated to show loc­a­tion for the detailed site plans and updated tur­bine house area17/10/25

Pro­ject Proterra Energy Ltd

283 — Dalmun­zie Estate

Draw­ing Descrip­tion Devel­op­ment Bound­ary Plan

Drawn (init./date): KM 10/10/2025 Checked (init./date): LS 15/10/2025 Scale & sheet size: 1:5000 @A3 Dimen­sions: m

Draw­ing No.: 283 – 06-DWG03-REV03

NOTES:

This doc­u­ment is con­fid­en­tial and for the sole use of the inten­ded recip­i­ent. Any unau­thor­ised use of this doc­u­ment is strictly prohibited.

Rev.DrawnCheckedDescrip­tionDate

Pro­ject Proterra Energy Ltd

283 — Dalmun­zie Estate

Draw­ing Descrip­tion Tur­bine House Elevations

Drawn (init./date): KM 29/09/2025 Checked (init./date): LS 15/10/2025 Scale & sheet size: 1:40 @ A3 Dimen­sions: m

Draw­ing No.: 283 – 06-DWG09-REV01

NOTES:

Plan and Elev­eation of the pro­posed abstrac­tion on the Allt Coire a’ Ghe­arraig (NO 08580 70406).

Single wall con­crete weir fit­ted with a stain­less steel abstrac­tion box fit­ted on the down­stream face. Stain­less steel Coanda screen fit­ted to the abstrac­tion box.

HOF Plate

Stain­less steel HOF plate with 60° angle and 131mm head to allow for Q90 = 5 l/​s to pass before abstrac­tion begins.

Screen Approach Weir

1200mm Width, 100mm Head, Cd=1. Weir passes Q=65l/s

Q_​design = 35 l/​s

Over­flow Weir:

Broad Cres­ted Weir 2.0m x 0.25m Cd = 1.7 Weir passes Q=425 l/​s

Q_0.1 = 375 l/​s (Q0.1 of the Allt Coire a’ Ghe­arraig) + 18 l/​s (Max abstrac­tion of Intake 2) = 393 l/​s

Total Flow accom­mod­ated by the intake:

  • HOF + Intake Weir + Over­flow Weir
  • = 5+65+425
  • = 495 l/​s

This doc­u­ment is con­fid­en­tial and for the sole use of the inten­ded recip­i­ent. Any unau­thor­ised use of this doc­u­ment is strictly prohibited.

Rev.DrawnCheckedDescrip­tionDate

Pro­ject Proterra Energy Ltd

283 — Dalmun­zie Estate

Draw­ing Descrip­tion Intake 1 Plan — Allt Coire a’ Ghearraig

Drawn (init./date): KM 17/09/2025 Checked (init./date): LS 15/10/2025 Scale & sheet size: 1:20 @ A3 Dimen­sions: mm

Draw­ing No.: 283 – 06-DWG11-REV01

NOTES:

Pro­posed abstrac­tion on an unnamed trib­u­tary of the Allt Coire a’ Ghe­arraig (NO 08668 70268)

Inter­lock­ing tim­ber sleep­ers construction

Aper­tures cut out for HOF ori­fice plate and trans­fer pipe.

HOF Plate

Stain­less steel plate with 65mm Ø ori­fice. 65mm Ø ori­fice, 125mm head (centre of ori­fice to bot­tom of trans­fer pipe), Cd=0.6 Q=3.118 l/​s Q>Q_90 = 3 l/​s

Trans­fer Pipe

Mater­i­al: 225mm Ø Twin­wall Pipe Length: 175m Ori­fice plate fit­ted to the upstream end. 125mm Ø Ori­fice, 300mm Head, Cd=0.6 Q=17.86 l/​s

Max Abstrac­tion = 1.3 x Q30 = 1.3 x 14 = 18.2 l/​s Q<1.3 x Q30

Over­flow Weir:

Broad Cres­ted Weir 1.0m x 0.20m Q=152 l/​s

Total Flow accom­mod­ated by the intake:

  • = HOF + Trans­fer Pipe + Over­flow Weir
  • = 3+18+152
  • = 173 l/​s

This doc­u­ment is con­fid­en­tial and for the sole use of the inten­ded recip­i­ent. Any unau­thor­ised use of this doc­u­ment is strictly prohibited.

Rev.DrawnCheckedDescrip­tionDate
02KMLSUpdated to show elev­a­tion orientation17/10/25

Pro­ject Proterra Energy Ltd

283 — Dalmun­zie Estate

Draw­ing Descrip­tion Intake 2 Unnamed Burn

Drawn (init./date): KM 15/10/2025 Checked (init./date): LS 15/10/2025 Scale & sheet size: 1:20 @ A3 Dimen­sions: mm

Draw­ing No.: 283 – 06-DWG04-REV02

NOTES:

  • Ground Level
  • Pen­stock Pipe

This doc­u­ment is con­fid­en­tial and for the sole use of the inten­ded recip­i­ent. Any unau­thor­ised use of this doc­u­ment is strictly prohibited.

Rev.DrawnCheckedDescrip­tionDate
02KMLSUpdated to show annota­tion of the scale with­in the inserts17/10/25

Pro­ject Proterra Energy Ltd

283 — Dalmun­zie Estate

Draw­ing Descrip­tion Pen­stock Section

Drawn (init./date): KM 13/10/2025 Checked (init./date): LS 15/10/2025 Scale & sheet size: See insert Dimen­sions: mm

Draw­ing No.: 283 – 06-DWG12-REV01